On Site - 3CX PBX
3CX is an open-standard, software based PBX that works with popular IP Phones, SIP trunks and Gateways. It’s a complete Unified Communications solution, which includes features such as web conferencing, presence, softphones, smartphone clients and more – without the inflated cost and management headaches of an ‘old style’ PBX.
It includes a web-based management console and also runs on mainstream OS making installation and management ever so easy. Setup takes minutes and 3CX will run on an existing server (not necessarily dedicated).